Teso_API/Teso API/AuthControllers/AccountController.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.IdentityModel.Tokens;
using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;
using Teso_API.Models;

namespace Teso_API.AuthControllers
{
    [AllowAnonymous, Route("account")]
    [ApiController]
    public class AccountController : Controller
    {
        readonly HttpClient Http = new HttpClient();
        public IConfiguration _configuration;
        private readonly TESOContext _context;
        public AccountController(TESOContext context, IConfiguration config)
        {
            _context = context;
            _configuration = config;
        }

        [Route("google-login")]
        public IActionResult GoogleLogin()
        {
            var properties = new AuthenticationProperties { RedirectUri = Url.Action("GoogleResponse") };

            return Challenge(properties, GoogleDefaults.AuthenticationScheme);
        }

        [Route("google-response")]
        public async Task<IActionResult> GoogleResponse()
        {
            var response = await HttpContext.AuthenticateAsync(CookieAuthenticationDefaults.AuthenticationScheme);
            GoogleUser user = new GoogleUser();
            user.Firstname = response.Principal.FindFirstValue(ClaimTypes.GivenName);
            user.Surname = response.Principal.FindFirstValue(ClaimTypes.Surname);
            user.Email = response.Principal.FindFirstValue(ClaimTypes.Email);
            user.Gender = response.Principal.FindFirstValue(ClaimTypes.Gender);
            user.Country = response.Principal.FindFirstValue(ClaimTypes.Country);

            string peopleApiKey = "";
            var googleAccountId = response.Principal.FindFirstValue(ClaimTypes.NameIdentifier);

            if (!UserAuthExists(googleAccountId))
            {
                var request = new HttpRequestMessage(HttpMethod.Get, $"https://people.googleapis.com/v1/people/{googleAccountId}?personFields=photos&key={peopleApiKey}");

                using var httpResponse = await Http.SendAsync(request);

                var photosResponse = await httpResponse.Content.ReadFromJsonAsync<PeopleApiPhotos>();
                user.pictureUri = photosResponse?.photos.FirstOrDefault()?.url;
                if (user.pictureUri != null)
                    user.pictureUri = await GetImageAsBase64Url(user.pictureUri);

                UserAuth auth = new UserAuth();
                auth.UserGUID = googleAccountId;
                auth.Status = "verified";
                auth.AccountType = await _context.AccountTypes.AsQueryable().Where(u => u.TypeName.ToLower() == "google").Select(f => f.TypeCode).FirstOrDefaultAsync();
                string[] splitted = user.Email.Split("@"[0]);
                auth.Username = splitted[0];

                TesoUserDetail detail = new TesoUserDetail();
                detail.UserGUID = googleAccountId;
                detail.Username = splitted[0];
                detail.ThumbnailDp = user.pictureUri;
                detail.Email = user.Email;
                detail.Gender = user.Gender;
                detail.Country = "+233";
                detail.Firstname = user.Firstname;
                detail.Surname = user.Surname;

                Registrar registrar = new Registrar();
                registrar.user = detail;
                registrar.authentication = auth;

                return await PostUserAuth(registrar);
            }
            return Ok("already Exists " + googleAccountId);
        }
        public async static Task<string> GetImageAsBase64Url(string url)
        {
            using (var client = new HttpClient())
            {
                var bytes = await client.GetByteArrayAsync(url);
                return Convert.ToBase64String(bytes);
            }
        }
        public async Task<ActionResult> PostUserAuth(Registrar userAuth)
        {
            _context.UserAuths.Add(userAuth.authentication);
            _context.TesoUserDetails.Add(userAuth.user);
            try
            {
                await _context.SaveChangesAsync();
                return Ok(userAuth.authentication.UserGUID);
            }
            catch (DbUpdateException)
            {
                if (UserAuthExists(userAuth.authentication.UserGUID))
                {
                    return Conflict();
                }
                else
                {
                    return BadRequest();
                }
            }

        }
        private bool UserAuthExists(string id)
        {
            return _context.UserAuths.Any(e => e.UserGUID == id);
        }
    }
}